The heat dissipation capacity of the cooling system of the traction converter directly affects whether the converter can work safely and stably for a long time. For the cooling system of the traction converter of the CRH3 EMU, the dimensions and boundary conditions required for model simulation are obtained by actual measurement and dynamic test tests, ensuring the authenticity of the simulation analysis. Using ANSYS/FLOTRAN to simulate the flow field and temperature field of the heat exchanger of the traction converter cooling system in three dimensions. Compared with the previous empirical simplified formula method or experimental measurement method, it avoids the problems of poor calculation accuracy and difficult measurement. The distribution of wind speed, pressure and temperature of the heat exchanger of the cooling system can be easily and clearly obtained. By comparing and designing the temperature change of the coolant inlet and outlet pipes, the heat dissipation power of the converter cooling system is calculated, which provides a reliable basis for the performance evaluation and structural improvement of the CRH3 traction converter cooling system.

Traction converter cooling system structure The CRH3 high-speed EMU traction converter adopts a fully enclosed circulating water cooling system. The cooling system consists of an expansion tank, a water pump, a water-air heat exchanger, a cooling module, a pipeline, etc. The cooling medium is a mixture of high-purity water and antifreeze. Traction converter filter cutoff valve fan heat exchanger, quick connector expansion tank water pump pressure sensor temperature sensor, pressure sensor temperature sensor cutoff valve, traction converter cooling system working principle, the cooling medium is pumped to the main converter by the water pump In the heat exchanger outside the device, part of the cooling medium flows from the heat exchanger to the expansion tank, and the remaining part of the cooling medium flows back to the main converter after being cooled by the heat exchanger, flows into the 8 phase component modules connected in parallel, and communicates with the power device. Heat exchange; then it is pumped out by the water pump, and then pumped to the heat exchanger by the water pump, and so on.

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